Results 1 to 7 of 7

Thread: Brown spot defect

  1. #1
    Join Date
    Oct 2020
    Posts
    16

    Question Brown spot defect

    Hi all,

    This week we have an issue with Nylon6,6 GF30 injection a Brown spot appeared in the extremity of the part. First, we clean up the mold vents thinking that's a problem in gas evacuation but it didn't work secondly we verify the clamping force but it didn't work also.

    Any suggestions would be appreciated.

    Thanks.

  2. #2
    Join Date
    Apr 2020
    Location
    Traverse City, MI
    Posts
    26

    Re: Brown spot defect

    Pictures of the defect will definitely help.

  3. #3
    Join Date
    Oct 2020
    Posts
    16

    Re: Brown spot defect

    Ok. thank you
    Attached Thumbnails Attached Thumbnails Capture.PNG  

  4. #4

    Re: Brown spot defect

    Very difficult to see. But it appears as gas trapped or material degradation.

    I'd recommend slowly the injection speed. If that doesn't work, perhaps lowering the barrel temps.

  5. #5
    Join Date
    Oct 2020
    Posts
    16

    Re: Brown spot defect

    thank you, I take your advice into consideration and I will give you the feedback.

  6. #6
    Join Date
    Sep 2020
    Posts
    28

    Re: Brown spot defect

    did you fix that?

  7. #7
    Join Date
    Oct 2020
    Posts
    16

    Re: Brown spot defect

    yes, I fix it. as you said I worked on the injection speed in the level of filling this area of the part and the results were Good.
    Thank you very much for your support.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •